Tesla Motors CEO Elon Musk has agreed to donate $1 million for a forthcoming museum honoring inventor Nikola Tesla — a response to a hilarious comic about the entrepreneur’s leading line of electric automobiles.

The illustrator called out Musk directly in the comic, and said that although the entrepreneur owed him nothing, his company has nonetheless become a billion-dollar market leader on Tesla’s name and tech. A follow-up letter, which included a note from the last surviving member of the inventor’s family to meet Tesla alive, asked Musk for the full $8 million needed to build the museum.

Musk personally called Inman to make the offer, who promptly thanks the CEO in a letter on his website.